Spark plug



Dec. 4,1923. 1,476,350

L. REYNOLDSET AL SPARK PLUG I Filed Jan. 26 1921 l 'awuenfow James 6. Stewart,

Leo E Reynolds,

Patented Dec. 4, 1923.

UNITED STATES PATENT OFFICE.

LEO F. REYNOLDS AND JAMES SAMUEL STEWART, OF EVANSTON, WYOMING.

SPARK PLUG.

Application filed January 26, 1921.

To all whom it may concern:

Be it known that we, Lno F. REYNOLDS and JAMES S. STEWART, citizens of the United States, and residents of Evanston, in the county of Uinta and State of WVyoming, have invented certain new and useful Improvements in Spark Plugs, of which the following is a specification.

This invention relates to an improved spark plug and the object of the invention is to arrange the porcelain bushing at an angle to the axis of the body of the plug, thus giving the advantage over other plugs, in that it will have a downward pitch when used. in valve in head motors having the spark plugs set horizontally, thus giving the oil a chance to drain away and not foul the plug. It can also be used. in other valve in head motors increasing the pitch in the ones having the plugs already on a pitch.

A further object of the invention is to provide a spark plug which can be very economically produced and easily assembled, in addition to serving the advantages above referred to.

Other and further objects of the invention will become readily apparent to persons skilled in the art, from a consideration of the following description when taken in conjunction with the accompanying drawings, in which Figure 1 is a front elevation of our improved spark plug,

Figure 2 a central longitudinal sectional view thereof, and

Figure 3 is an end view.

Referring to the drawings in detail, our improved spark plug is shown as embodying an externally threaded casing or body 10 having a wrench engaging head or surface 11 and provided with a sleeve extension 12 internally threaded at said end. This extension is arranged diagonally of the casing, or is set at an angle to the axis of the body of the plug in alinement with the bore 13 through the same, said bore being provided with a circumscribing flange 14 serving as a stop or limiting member for the porcelain bushing 15, which latter may be of the usual or any preferred construction.

The porcelain or porcelain bushing 15 is formed with a shoulder for engagement with the flange 1& and in addition, is provided with an asbestos or like packing ring 16 in Serial No. 440,181.

order to prevent injury, as well as to form a tight joint wien the porcelain bushing is secured in position through the medium of a packing nut 17 which is externally threaded to engage the internal threads of the sleeve extension 12, the nut having a wrenchengaging surface or enlargement for applying or removing it, as indicated in the drawings. The electrode extending through the bushing is indicated at 18, the outer end thereof being adapted for connection with a terminal wire and the inner end forming a spark point 19 for cooperation with the spark point 20, for-min the positive and negative electrodes in the usual manner.

Thus, it will be seen that when the plug is applied in the position shown in the drawing, the bushing will have a downward pitch as well as the interior bore of the body, when the plugs are set horizontally, thus giving the oil a chance to drain away and preventing the plug from fouling, Also, the device may be used in other valve in head motors so as to increase the pitch in the ones having the plugs already on a pitch, that is, where the threaded openings receiving the body of the plug, are set at an angle instead of axially of the cylinder. Of course, the body may be readily bored out and threaded to receive the porcelain bushing, and when assembled, will not be likely to get out of working order. Constant annoyance from the collection of carbon and soot or fouling of the plugs will therefore be considerably alleviated.

111 view of the foregoing, it is thought that the operation of the device will he readily understood and in View of the simplicity and practical value that it will commend itself to those skilled in the art.

Having thus described our invention, what we elann 1s:--

A spark plug for valve in the head engines comprising a shell adapted to be secured in an approximately horizontal position to one side of an engine cylinder and having a straight bore extending diagonally thereof, and an electrode extending longitudinally through said shell, the bore of said shell being inclined downwardly toward the forward end of the plug whereby the oil received in the shell is promptly drained.

LEO F. REYNOLDS. JAMES SAMUEL STEWART. 

